Trust Management Model Based On Global Computing In Group-class PDM System

Trust management is a new trend of distributed security control system. To solve the problems in distributed PDM security control system, we propose a new trust model, which has good capability of contents expanding, effective ability of hostile recommendation restraining, fine adaptability to distributed PDM system.In the 1st chapter, we introduce trust management briefly to make the readers understand the development and application of trust management and some relevant concepts. We present the demands of trust management in P2P (Peer-to-Peer) network environments and analyze the current trust models in P2P network; we also explain the necessity of trust management in distributed PDM system; we give the aim of the study and main contents of the paper at last.In the 2nd chapter, we analyze the advantages and disadvantages of current trust models, bring out the design standards of trust model in group-class PDM (Product Data Management) system and briefly introduce our trust model based on global computing. Our trust model mainly includes three sub-models: representing model, measuring model and evaluating model. In the paper, We concentrate our energy on trust measuring modeling and trust evaluating modeling.In the 3rd chapter, we introduce Marco Carbone's model into PDM trust security system to solve the problems of poor-expanding ability of trust language and low-supporting of fuzzy nature in trust; according to the trust structure of Marco Carbone's model, we establish the policy language suitable to distributed PDM system; finally, we give an application in PDM system to illustrate the usage of the language.In the 4th chapter, we study the trust measuring model. We give the relevant concepts about trust at first, and then give an iterative arithmetic of common gobal trust.In the 5th chapter, we analyze the classic trust evaluating models, and give the reformative eigenRep Model. In the paper, we give detailed description of global computing procedure to restrain sybil attack and slandering.In the 6th chapter, we give the trust management architecture of group-class PDM system and show readers how to implement it into our project AVIDM 3.0 (Aerospace Vehicle Integrated Design Manufacture).In the end, all of the works in this dissertation are summed up, and their futures are prospected.